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using separate funcs for each way of looping/printing

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This commit is contained in:
Dan Buch 2011-09-19 23:05:31 -04:00
parent 0a0fc453c5
commit bf6752edd6
1 changed files with 37 additions and 9 deletions
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46
ex15.c
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@ -1,15 +1,7 @@
#include <stdio.h> #include <stdio.h>
int main(int argc, char *argv[]) void print_with_array_indexing(int count, char *names[], int ages[])
{ {
// create two arrays we care about
int ages[] = {23, 43, 12, 89, 2};
char *names[] = {
"Alan", "Frank",
"Mary", "John", "Lisa"
};
// safely get the size of ages
int count = sizeof(ages) / sizeof(int);
int i = 0; int i = 0;
// first way using indexing // first way using indexing
@ -19,7 +11,11 @@ int main(int argc, char *argv[])
} }
printf("---\n"); printf("---\n");
}
void print_with_pointer_arithmetic(int count, char *names[], int ages[])
{
int i;
// setup the pointers to the start of the arrays // setup the pointers to the start of the arrays
int *cur_age = ages; int *cur_age = ages;
char **cur_name = names; char **cur_name = names;
@ -31,7 +27,13 @@ int main(int argc, char *argv[])
} }
printf("---\n"); printf("---\n");
}
void print_with_pointers_as_arrays(int count, char *names[], int ages[])
{
int i;
int *cur_age = ages;
char **cur_name = names;
// third way, pointers are just arrays // third way, pointers are just arrays
for(i = 0; i < count; i++) { for(i = 0; i < count; i++) {
printf("%s is %d years old again.\n", printf("%s is %d years old again.\n",
@ -40,6 +42,13 @@ int main(int argc, char *argv[])
printf("---\n"); printf("---\n");
}
void print_in_stupidly_complex_way(int count, char *names[], int ages[])
{
int *cur_age = ages;
char **cur_name = names;
// fourth way with pointers in a stupid complex way // fourth way with pointers in a stupid complex way
for(cur_name = names, cur_age = ages; for(cur_name = names, cur_age = ages;
(cur_age - ages) < count; (cur_age - ages) < count;
@ -50,7 +59,26 @@ int main(int argc, char *argv[])
} }
printf("---\n"); printf("---\n");
}
int main(int argc, char *argv[])
{
// create two arrays we care about
int ages[] = {23, 43, 12, 89, 2};
char *names[] = {
"Alan", "Frank",
"Mary", "John", "Lisa"
};
// safely get the size of ages
int count = sizeof(ages) / sizeof(int);
print_with_array_indexing(count, names, ages);
print_with_pointer_arithmetic(count, names, ages);
print_with_pointers_as_arrays(count, names, ages);
print_in_stupidly_complex_way(count, names, ages);
int i;
char **arg = argv; char **arg = argv;
for(i = 0; i < argc; i++) { for(i = 0; i < argc; i++) {
printf("argument %d is '%s' (address = %p)\n", i, *arg, arg); printf("argument %d is '%s' (address = %p)\n", i, *arg, arg);